Initial commit, code not working

.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+/.swiftpm
+/Package.resolved

Package.swift

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+// swift-tools-version:5.3
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "hummingbird-mustache",
+    products: [
+        .library(name: "HummingbirdMustache", targets: ["HummingbirdMustache"]),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/hummingbird-project/hummingbird.git", from: "0.6.0"),
+    ],
+    targets: [
+        .target(name: "HummingbirdMustache", dependencies: [
+            .product(name: "Hummingbird", package: "hummingbird")
+        ]),
+        .testTarget(name: "HummingbirdMustacheTests", dependencies: ["HummingbirdMustache"]),
+    ]
+)

README.md

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+# hummingbird-mustache
+
+A description of this package.

Sources/HummingbirdMustache/template.swift

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+import Hummingbird
+
+enum HBMustacheError: Error {
+    case sectionCloseNameIncorrect
+    case unfinishedSectionName
+}
+
+class HBTemplate {
+    init(_ string: String) throws {
+        self.tokens = try Self.parse(string)
+    }
+
+    static func parse(_ string: String) throws -> [Token] {
+        var parser = Parser(string)
+        return try parse(&parser, sectionName: nil)
+    }
+
+    static func parse(_ parser: inout Parser, sectionName: String?) throws -> [Token] {
+        var tokens: [Token] = []
+        while !parser.reachedEnd() {
+            let text = try parser.read(untilString: "{{", throwOnOverflow: false, skipToEnd: true)
+            tokens.append(.text(text.string))
+            switch parser.current() {
+            case "#":
+                let name = try readSectionName(&parser)
+                let sectionTokens = try parse(&parser, sectionName: name)
+                tokens.append(.section(name, sectionTokens))
+
+            case "^":
+                let name = try readSectionName(&parser)
+                let sectionTokens = try parse(&parser, sectionName: name)
+                tokens.append(.invertedSection(name, sectionTokens))
+
+            case "/":
+                let name = try readSectionName(&parser)
+                if name != sectionName {
+                    throw HBMustacheError.sectionCloseNameIncorrect
+                }
+                return tokens
+
+            case "{":
+                let name = try readSectionName(&parser)
+                guard try parser.read("}") else { throw HBMustacheError.unfinishedSectionName }
+                tokens.append(.variable(name))
+
+            case "!":
+                _ = try readSection(&parser)
+
+            default:
+                let name = try readSectionName(&parser)
+                tokens.append(.variable(name))
+            }
+        }
+        return tokens
+    }
+
+    static func readSectionName(_ parser: inout Parser) throws -> String {
+        let text = parser.read(while: { $0.isLetter || $0.isNumber } )
+        guard try parser.read("}"), try parser.read("}") else { throw HBMustacheError.unfinishedSectionName }
+        return text.string
+    }
+
+    static func readSection(_ parser: inout Parser) throws -> String {
+        let text = try parser.read(untilString: "}}", throwOnOverflow: true, skipToEnd: true)
+        return text.string
+    }
+
+    enum Token {
+        case text(String)
+        case variable(String)
+        case section(String, [Token])
+        case invertedSection(String, [Token])
+    }
+
+    let tokens: [Token]
+}
+

Tests/HummingbirdMustacheTests/hummingbird_mustacheTests.swift

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+import XCTest
+@testable import hummingbird_mustache
+
+final class hummingbird_mustacheTests: XCTestCase {
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+        XCTAssertEqual(hummingbird_mustache().text, "Hello, World!")
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

Tests/LinuxMain.swift

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+import XCTest
+
+import hummingbird_mustacheTests
+
+var tests = [XCTestCaseEntry]()
+tests += hummingbird_mustacheTests.allTests()
+XCTMain(tests)